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Intermittent transform rectifier unit


Cc5
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Greetings,

We’ve been having an ongoing RTRU issue that only occurs in flight, usually a couple of times during touch and gos/takeoff.  TR3 load will drop below 5, kick out a fail for 2-3 seconds then recover and go back to functioning properly. A few things we’ve changed include the TR unit, BIU, as well as the associated diode.  
 

Was curious if anyone has seen a similar issue or has any input on potential culprits.  All meter readings weve checked have been good, as it does not fail on ground.

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7 hours ago, Cc5 said:

Greetings,

We’ve been having an ongoing RTRU issue that only occurs in flight, usually a couple of times during touch and gos/takeoff.  TR3 load will drop below 5, kick out a fail for 2-3 seconds then recover and go back to functioning properly. A few things we’ve changed include the TR unit, BIU, as well as the associated diode.  
 

Was curious if anyone has seen a similar issue or has any input on potential culprits.  All meter readings weve checked have been good, as it does not fail on ground.

Model of aircraft

Best regards

 

Munir Abbasi

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  • 1 month later...

Still dealing with this issue unfortunately.  We noticed during takeoff tr3 load skyrockets 15%+ above tr1 inducing a dc bus overload.  It will repeatedly fail and recover for 2 seconds a handful of times only during takeoffs.

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6 hours ago, Cc5 said:

Still dealing with this issue unfortunately.  We noticed during takeoff tr3 load skyrockets 15%+ above tr1 inducing a dc bus overload.  It will repeatedly fail and recover for 2 seconds a handful of times only during takeoffs.

Check grounding /bonding wire of unit

regards

Munir Abbasi

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Sorry, don't have any experience on the J models, or any tech data. What base are you at?

I don't know if there are any relays involved in the DC system on those birds, but if there are, swap two of them. I would also check the AC input connections to the TRs.

 

 

 

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